linux/fs/nfs/nfs2xdr.c

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/*
* linux/fs/nfs/nfs2xdr.c
*
* XDR functions to encode/decode NFS RPC arguments and results.
*
* Copyright (C) 1992, 1993, 1994 Rick Sladkey
* Copyright (C) 1996 Olaf Kirch
* 04 Aug 1998 Ion Badulescu <ionut@cs.columbia.edu>
* FIFO's need special handling in NFSv2
*/
#include <linux/param.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs2.h>
#include <linux/nfs_fs.h>
#include "internal.h"
#define NFSDBG_FACILITY NFSDBG_XDR
/* Mapping from NFS error code to "errno" error code. */
#define errno_NFSERR_IO EIO
/*
* Declare the space requirements for NFS arguments and replies as
* number of 32bit-words
*/
#define NFS_fhandle_sz (8)
#define NFS_sattr_sz (8)
#define NFS_filename_sz (1+(NFS2_MAXNAMLEN>>2))
#define NFS_path_sz (1+(NFS2_MAXPATHLEN>>2))
#define NFS_fattr_sz (17)
#define NFS_info_sz (5)
#define NFS_entry_sz (NFS_filename_sz+3)
#define NFS_diropargs_sz (NFS_fhandle_sz+NFS_filename_sz)
#define NFS_removeargs_sz (NFS_fhandle_sz+NFS_filename_sz)
#define NFS_sattrargs_sz (NFS_fhandle_sz+NFS_sattr_sz)
#define NFS_readlinkargs_sz (NFS_fhandle_sz)
#define NFS_readargs_sz (NFS_fhandle_sz+3)
#define NFS_writeargs_sz (NFS_fhandle_sz+4)
#define NFS_createargs_sz (NFS_diropargs_sz+NFS_sattr_sz)
#define NFS_renameargs_sz (NFS_diropargs_sz+NFS_diropargs_sz)
#define NFS_linkargs_sz (NFS_fhandle_sz+NFS_diropargs_sz)
#define NFS_symlinkargs_sz (NFS_diropargs_sz+1+NFS_sattr_sz)
#define NFS_readdirargs_sz (NFS_fhandle_sz+2)
#define NFS_attrstat_sz (1+NFS_fattr_sz)
#define NFS_diropres_sz (1+NFS_fhandle_sz+NFS_fattr_sz)
#define NFS_readlinkres_sz (2)
#define NFS_readres_sz (1+NFS_fattr_sz+1)
#define NFS_writeres_sz (NFS_attrstat_sz)
#define NFS_stat_sz (1)
#define NFS_readdirres_sz (1)
#define NFS_statfsres_sz (1+NFS_info_sz)
/*
* While encoding arguments, set up the reply buffer in advance to
* receive reply data directly into the page cache.
*/
static void prepare_reply_buffer(struct rpc_rqst *req, struct page **pages,
unsigned int base, unsigned int len,
unsigned int bufsize)
{
struct rpc_auth *auth = req->rq_cred->cr_auth;
unsigned int replen;
replen = RPC_REPHDRSIZE + auth->au_rslack + bufsize;
xdr_inline_pages(&req->rq_rcv_buf, replen << 2, pages, base, len);
}
/*
* Common NFS XDR functions as inlines
*/
static inline __be32 *
xdr_decode_fhandle(__be32 *p, struct nfs_fh *fhandle)
{
/* NFSv2 handles have a fixed length */
fhandle->size = NFS2_FHSIZE;
memcpy(fhandle->data, p, NFS2_FHSIZE);
return p + XDR_QUADLEN(NFS2_FHSIZE);
}
static inline __be32*
xdr_encode_time(__be32 *p, const struct timespec *timep)
{
*p++ = htonl(timep->tv_sec);
/* Convert nanoseconds into microseconds */
*p++ = htonl(timep->tv_nsec ? timep->tv_nsec / 1000 : 0);
return p;
}
static inline __be32*
xdr_encode_current_server_time(__be32 *p, const struct timespec *timep)
{
/*
* Passing the invalid value useconds=1000000 is a
* Sun convention for "set to current server time".
* It's needed to make permissions checks for the
* "touch" program across v2 mounts to Solaris and
* Irix boxes work correctly. See description of
* sattr in section 6.1 of "NFS Illustrated" by
* Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
*/
*p++ = htonl(timep->tv_sec);
*p++ = htonl(1000000);
return p;
}
static inline __be32*
xdr_decode_time(__be32 *p, struct timespec *timep)
{
timep->tv_sec = ntohl(*p++);
/* Convert microseconds into nanoseconds */
timep->tv_nsec = ntohl(*p++) * 1000;
return p;
}
static __be32 *
xdr_decode_fattr(__be32 *p, struct nfs_fattr *fattr)
{
u32 rdev, type;
type = ntohl(*p++);
fattr->mode = ntohl(*p++);
fattr->nlink = ntohl(*p++);
fattr->uid = ntohl(*p++);
fattr->gid = ntohl(*p++);
fattr->size = ntohl(*p++);
fattr->du.nfs2.blocksize = ntohl(*p++);
rdev = ntohl(*p++);
fattr->du.nfs2.blocks = ntohl(*p++);
fattr->fsid.major = ntohl(*p++);
fattr->fsid.minor = 0;
fattr->fileid = ntohl(*p++);
p = xdr_decode_time(p, &fattr->atime);
p = xdr_decode_time(p, &fattr->mtime);
p = xdr_decode_time(p, &fattr->ctime);
fattr->valid |= NFS_ATTR_FATTR_V2;
fattr->rdev = new_decode_dev(rdev);
if (type == NFCHR && rdev == NFS2_FIFO_DEV) {
fattr->mode = (fattr->mode & ~S_IFMT) | S_IFIFO;
fattr->rdev = 0;
}
return p;
}
/*
* Encode/decode NFSv2 basic data types
*
* Basic NFSv2 data types are defined in section 2.3 of RFC 1094:
* "NFS: Network File System Protocol Specification".
*
* Not all basic data types have their own encoding and decoding
* functions. For run-time efficiency, some data types are encoded
* or decoded inline.
*/
/*
* 2.3.3. fhandle
*
* typedef opaque fhandle[FHSIZE];
*/
static void encode_fhandle(struct xdr_stream *xdr, const struct nfs_fh *fh)
{
__be32 *p;
BUG_ON(fh->size != NFS2_FHSIZE);
p = xdr_reserve_space(xdr, NFS2_FHSIZE);
memcpy(p, fh->data, NFS2_FHSIZE);
}
/*
* 2.3.6. sattr
*
* struct sattr {
* unsigned int mode;
* unsigned int uid;
* unsigned int gid;
* unsigned int size;
* timeval atime;
* timeval mtime;
* };
*/
#define NFS2_SATTR_NOT_SET (0xffffffff)
static __be32 *xdr_time_not_set(__be32 *p)
{
*p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
*p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
return p;
}
static void encode_sattr(struct xdr_stream *xdr, const struct iattr *attr)
{
__be32 *p;
p = xdr_reserve_space(xdr, NFS_sattr_sz << 2);
if (attr->ia_valid & ATTR_MODE)
*p++ = cpu_to_be32(attr->ia_mode);
else
*p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
if (attr->ia_valid & ATTR_UID)
*p++ = cpu_to_be32(attr->ia_uid);
else
*p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
if (attr->ia_valid & ATTR_GID)
*p++ = cpu_to_be32(attr->ia_gid);
else
*p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
if (attr->ia_valid & ATTR_SIZE)
*p++ = cpu_to_be32((u32)attr->ia_size);
else
*p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
if (attr->ia_valid & ATTR_ATIME_SET)
p = xdr_encode_time(p, &attr->ia_atime);
else if (attr->ia_valid & ATTR_ATIME)
p = xdr_encode_current_server_time(p, &attr->ia_atime);
else
p = xdr_time_not_set(p);
if (attr->ia_valid & ATTR_MTIME_SET)
xdr_encode_time(p, &attr->ia_mtime);
else if (attr->ia_valid & ATTR_MTIME)
xdr_encode_current_server_time(p, &attr->ia_mtime);
else
xdr_time_not_set(p);
}
/*
* 2.3.7. filename
*
* typedef string filename<MAXNAMLEN>;
*/
static void encode_filename(struct xdr_stream *xdr,
const char *name, u32 length)
{
__be32 *p;
BUG_ON(length > NFS2_MAXNAMLEN);
p = xdr_reserve_space(xdr, 4 + length);
xdr_encode_opaque(p, name, length);
}
/*
* 2.3.8. path
*
* typedef string path<MAXPATHLEN>;
*/
static void encode_path(struct xdr_stream *xdr, struct page **pages, u32 length)
{
__be32 *p;
BUG_ON(length > NFS2_MAXPATHLEN);
p = xdr_reserve_space(xdr, 4);
*p = cpu_to_be32(length);
xdr_write_pages(xdr, pages, 0, length);
}
/*
* 2.3.10. diropargs
*
* struct diropargs {
* fhandle dir;
* filename name;
* };
*/
static void encode_diropargs(struct xdr_stream *xdr, const struct nfs_fh *fh,
const char *name, u32 length)
{
encode_fhandle(xdr, fh);
encode_filename(xdr, name, length);
}
/*
* NFSv2 XDR encode functions
*
* NFSv2 argument types are defined in section 2.2 of RFC 1094:
* "NFS: Network File System Protocol Specification".
*/
static int nfs2_xdr_enc_fhandle(struct rpc_rqst *req, __be32 *p,
const struct nfs_fh *fh)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_fhandle(&xdr, fh);
return 0;
}
/*
* 2.2.3. sattrargs
*
* struct sattrargs {
* fhandle file;
* sattr attributes;
* };
*/
static int nfs2_xdr_enc_sattrargs(struct rpc_rqst *req, __be32 *p,
const struct nfs_sattrargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_fhandle(&xdr, args->fh);
encode_sattr(&xdr, args->sattr);
return 0;
}
static int nfs2_xdr_enc_diropargs(struct rpc_rqst *req, __be32 *p,
const struct nfs_diropargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_diropargs(&xdr, args->fh, args->name, args->len);
return 0;
}
static int nfs2_xdr_enc_readlinkargs(struct rpc_rqst *req, __be32 *p,
const struct nfs_readlinkargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_fhandle(&xdr, args->fh);
prepare_reply_buffer(req, args->pages, args->pgbase,
args->pglen, NFS_readlinkres_sz);
return 0;
}
/*
* 2.2.7. readargs
*
* struct readargs {
* fhandle file;
* unsigned offset;
* unsigned count;
* unsigned totalcount;
* };
*/
static void encode_readargs(struct xdr_stream *xdr,
const struct nfs_readargs *args)
{
u32 offset = args->offset;
u32 count = args->count;
__be32 *p;
encode_fhandle(xdr, args->fh);
p = xdr_reserve_space(xdr, 4 + 4 + 4);
*p++ = cpu_to_be32(offset);
*p++ = cpu_to_be32(count);
*p = cpu_to_be32(count);
}
static int nfs2_xdr_enc_readargs(struct rpc_rqst *req, __be32 *p,
const struct nfs_readargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_readargs(&xdr, args);
prepare_reply_buffer(req, args->pages, args->pgbase,
args->count, NFS_readres_sz);
req->rq_rcv_buf.flags |= XDRBUF_READ;
return 0;
}
/*
* Decode READ reply
*/
static int
nfs_xdr_readres(struct rpc_rqst *req, __be32 *p, struct nfs_readres *res)
{
struct kvec *iov = req->rq_rcv_buf.head;
size_t hdrlen;
u32 count, recvd;
int status;
if ((status = ntohl(*p++)))
return nfs_stat_to_errno(status);
p = xdr_decode_fattr(p, res->fattr);
count = ntohl(*p++);
res->eof = 0;
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
if (iov->iov_len < hdrlen) {
dprintk("NFS: READ reply header overflowed:"
"length %Zu > %Zu\n", hdrlen, iov->iov_len);
return -errno_NFSERR_IO;
} else if (iov->iov_len != hdrlen) {
dprintk("NFS: READ header is short. iovec will be shifted.\n");
xdr_shift_buf(&req->rq_rcv_buf, iov->iov_len - hdrlen);
}
recvd = req->rq_rcv_buf.len - hdrlen;
if (count > recvd) {
dprintk("NFS: server cheating in read reply: "
"count %u > recvd %u\n", count, recvd);
count = recvd;
}
dprintk("RPC: readres OK count %u\n", count);
if (count < res->count)
res->count = count;
return count;
}
/*
* 2.2.9. writeargs
*
* struct writeargs {
* fhandle file;
* unsigned beginoffset;
* unsigned offset;
* unsigned totalcount;
* nfsdata data;
* };
*/
static void encode_writeargs(struct xdr_stream *xdr,
const struct nfs_writeargs *args)
{
u32 offset = args->offset;
u32 count = args->count;
__be32 *p;
encode_fhandle(xdr, args->fh);
p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
*p++ = cpu_to_be32(offset);
*p++ = cpu_to_be32(offset);
*p++ = cpu_to_be32(count);
/* nfsdata */
*p = cpu_to_be32(count);
xdr_write_pages(xdr, args->pages, args->pgbase, count);
}
static int nfs2_xdr_enc_writeargs(struct rpc_rqst *req, __be32 *p,
const struct nfs_writeargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_writeargs(&xdr, args);
xdr.buf->flags |= XDRBUF_WRITE;
return 0;
}
/*
* 2.2.10. createargs
*
* struct createargs {
* diropargs where;
* sattr attributes;
* };
*/
static int nfs2_xdr_enc_createargs(struct rpc_rqst *req, __be32 *p,
const struct nfs_createargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_diropargs(&xdr, args->fh, args->name, args->len);
encode_sattr(&xdr, args->sattr);
return 0;
}
static int nfs2_xdr_enc_removeargs(struct rpc_rqst *req, __be32 *p,
const struct nfs_removeargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_diropargs(&xdr, args->fh, args->name.name, args->name.len);
return 0;
}
/*
* 2.2.12. renameargs
*
* struct renameargs {
* diropargs from;
* diropargs to;
* };
*/
static int nfs2_xdr_enc_renameargs(struct rpc_rqst *req, __be32 *p,
const struct nfs_renameargs *args)
{
const struct qstr *old = args->old_name;
const struct qstr *new = args->new_name;
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_diropargs(&xdr, args->old_dir, old->name, old->len);
encode_diropargs(&xdr, args->new_dir, new->name, new->len);
return 0;
}
/*
* 2.2.13. linkargs
*
* struct linkargs {
* fhandle from;
* diropargs to;
* };
*/
static int nfs2_xdr_enc_linkargs(struct rpc_rqst *req, __be32 *p,
const struct nfs_linkargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_fhandle(&xdr, args->fromfh);
encode_diropargs(&xdr, args->tofh, args->toname, args->tolen);
return 0;
}
/*
* 2.2.14. symlinkargs
*
* struct symlinkargs {
* diropargs from;
* path to;
* sattr attributes;
* };
*/
static int nfs2_xdr_enc_symlinkargs(struct rpc_rqst *req, __be32 *p,
const struct nfs_symlinkargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_diropargs(&xdr, args->fromfh, args->fromname, args->fromlen);
encode_path(&xdr, args->pages, args->pathlen);
encode_sattr(&xdr, args->sattr);
return 0;
}
/*
* 2.2.17. readdirargs
*
* struct readdirargs {
* fhandle dir;
* nfscookie cookie;
* unsigned count;
* };
*/
static void encode_readdirargs(struct xdr_stream *xdr,
const struct nfs_readdirargs *args)
{
__be32 *p;
encode_fhandle(xdr, args->fh);
p = xdr_reserve_space(xdr, 4 + 4);
*p++ = cpu_to_be32(args->cookie);
*p = cpu_to_be32(args->count);
}
static int nfs2_xdr_enc_readdirargs(struct rpc_rqst *req, __be32 *p,
const struct nfs_readdirargs *args)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
encode_readdirargs(&xdr, args);
prepare_reply_buffer(req, args->pages, 0,
args->count, NFS_readdirres_sz);
return 0;
}
/*
* Decode the result of a readdir call.
* We're not really decoding anymore, we just leave the buffer untouched
* and only check that it is syntactically correct.
* The real decoding happens in nfs_decode_entry below, called directly
* from nfs_readdir for each entry.
*/
static int
nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
{
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
struct kvec *iov = rcvbuf->head;
struct page **page;
size_t hdrlen;
unsigned int pglen, recvd;
int status;
if ((status = ntohl(*p++)))
return nfs_stat_to_errno(status);
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
if (iov->iov_len < hdrlen) {
dprintk("NFS: READDIR reply header overflowed:"
"length %Zu > %Zu\n", hdrlen, iov->iov_len);
return -errno_NFSERR_IO;
} else if (iov->iov_len != hdrlen) {
dprintk("NFS: READDIR header is short. iovec will be shifted.\n");
xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
}
pglen = rcvbuf->page_len;
recvd = rcvbuf->len - hdrlen;
if (pglen > recvd)
pglen = recvd;
page = rcvbuf->pages;
return pglen;
}
static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
{
dprintk("nfs: %s: prematurely hit end of receive buffer. "
"Remaining buffer length is %tu words.\n",
func, xdr->end - xdr->p);
}
__be32 *
NFS: Readdir plus in v4 By requsting more attributes during a readdir, we can mimic the readdir plus operation that was in NFSv3. To test, I ran the command `ls -lU --color=none` on directories with various numbers of files. Without readdir plus, I see this: n files | 100 | 1,000 | 10,000 | 100,000 | 1,000,000 --------+-----------+-----------+-----------+-----------+---------- real | 0m00.153s | 0m00.589s | 0m05.601s | 0m56.691s | 9m59.128s user | 0m00.007s | 0m00.007s | 0m00.077s | 0m00.703s | 0m06.800s sys | 0m00.010s | 0m00.070s | 0m00.633s | 0m06.423s | 1m10.005s access | 3 | 1 | 1 | 4 | 31 getattr | 2 | 1 | 1 | 1 | 1 lookup | 104 | 1,003 | 10,003 | 100,003 | 1,000,003 readdir | 2 | 16 | 158 | 1,575 | 15,749 total | 111 | 1,021 | 10,163 | 101,583 | 1,015,784 With readdir plus enabled, I see this: n files | 100 | 1,000 | 10,000 | 100,000 | 1,000,000 --------+-----------+-----------+-----------+-----------+---------- real | 0m00.115s | 0m00.206s | 0m01.079s | 0m12.521s | 2m07.528s user | 0m00.003s | 0m00.003s | 0m00.040s | 0m00.290s | 0m03.296s sys | 0m00.007s | 0m00.020s | 0m00.120s | 0m01.357s | 0m17.556s access | 3 | 1 | 1 | 1 | 7 getattr | 2 | 1 | 1 | 1 | 1 lookup | 4 | 3 | 3 | 3 | 3 readdir | 6 | 62 | 630 | 6,300 | 62,993 total | 15 | 67 | 635 | 6,305 | 63,004 Readdir plus disabled has about a 16x increase in the number of rpc calls and is 4 - 5 times slower on large directories. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-10-21 20:33:18 +00:00
nfs_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry, struct nfs_server *server, int plus)
{
__be32 *p;
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
goto out_overflow;
if (!ntohl(*p++)) {
p = xdr_inline_decode(xdr, 4);
if (unlikely(!p))
goto out_overflow;
if (!ntohl(*p++))
return ERR_PTR(-EAGAIN);
entry->eof = 1;
return ERR_PTR(-EBADCOOKIE);
}
p = xdr_inline_decode(xdr, 8);
if (unlikely(!p))
goto out_overflow;
entry->ino = ntohl(*p++);
entry->len = ntohl(*p++);
p = xdr_inline_decode(xdr, entry->len + 4);
if (unlikely(!p))
goto out_overflow;
entry->name = (const char *) p;
p += XDR_QUADLEN(entry->len);
entry->prev_cookie = entry->cookie;
entry->cookie = ntohl(*p++);
entry->d_type = DT_UNKNOWN;
p = xdr_inline_peek(xdr, 8);
if (p != NULL)
entry->eof = !p[0] && p[1];
else
entry->eof = 0;
return p;
out_overflow:
print_overflow_msg(__func__, xdr);
return ERR_PTR(-EAGAIN);
}
/*
* NFS XDR decode functions
*/
/*
* Decode simple status reply
*/
static int
nfs_xdr_stat(struct rpc_rqst *req, __be32 *p, void *dummy)
{
int status;
if ((status = ntohl(*p++)) != 0)
status = nfs_stat_to_errno(status);
return status;
}
/*
* Decode attrstat reply
* GETATTR, SETATTR, WRITE
*/
static int
nfs_xdr_attrstat(struct rpc_rqst *req, __be32 *p, struct nfs_fattr *fattr)
{
int status;
if ((status = ntohl(*p++)))
return nfs_stat_to_errno(status);
xdr_decode_fattr(p, fattr);
return 0;
}
/*
* Decode diropres reply
* LOOKUP, CREATE, MKDIR
*/
static int
nfs_xdr_diropres(struct rpc_rqst *req, __be32 *p, struct nfs_diropok *res)
{
int status;
if ((status = ntohl(*p++)))
return nfs_stat_to_errno(status);
p = xdr_decode_fhandle(p, res->fh);
xdr_decode_fattr(p, res->fattr);
return 0;
}
/*
* Decode READLINK reply
*/
static int
nfs_xdr_readlinkres(struct rpc_rqst *req, __be32 *p, void *dummy)
{
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
struct kvec *iov = rcvbuf->head;
size_t hdrlen;
u32 len, recvd;
int status;
if ((status = ntohl(*p++)))
return nfs_stat_to_errno(status);
/* Convert length of symlink */
len = ntohl(*p++);
if (len >= rcvbuf->page_len) {
dprintk("nfs: server returned giant symlink!\n");
return -ENAMETOOLONG;
}
hdrlen = (u8 *) p - (u8 *) iov->iov_base;
if (iov->iov_len < hdrlen) {
dprintk("NFS: READLINK reply header overflowed:"
"length %Zu > %Zu\n", hdrlen, iov->iov_len);
return -errno_NFSERR_IO;
} else if (iov->iov_len != hdrlen) {
dprintk("NFS: READLINK header is short. iovec will be shifted.\n");
xdr_shift_buf(rcvbuf, iov->iov_len - hdrlen);
}
recvd = req->rq_rcv_buf.len - hdrlen;
if (recvd < len) {
dprintk("NFS: server cheating in readlink reply: "
"count %u > recvd %u\n", len, recvd);
return -EIO;
}
xdr_terminate_string(rcvbuf, len);
return 0;
}
/*
* Decode WRITE reply
*/
static int
nfs_xdr_writeres(struct rpc_rqst *req, __be32 *p, struct nfs_writeres *res)
{
res->verf->committed = NFS_FILE_SYNC;
return nfs_xdr_attrstat(req, p, res->fattr);
}
/*
* Decode STATFS reply
*/
static int
nfs_xdr_statfsres(struct rpc_rqst *req, __be32 *p, struct nfs2_fsstat *res)
{
int status;
if ((status = ntohl(*p++)))
return nfs_stat_to_errno(status);
res->tsize = ntohl(*p++);
res->bsize = ntohl(*p++);
res->blocks = ntohl(*p++);
res->bfree = ntohl(*p++);
res->bavail = ntohl(*p++);
return 0;
}
/*
* We need to translate between nfs status return values and
* the local errno values which may not be the same.
*/
static struct {
int stat;
int errno;
} nfs_errtbl[] = {
{ NFS_OK, 0 },
{ NFSERR_PERM, -EPERM },
{ NFSERR_NOENT, -ENOENT },
{ NFSERR_IO, -errno_NFSERR_IO},
{ NFSERR_NXIO, -ENXIO },
/* { NFSERR_EAGAIN, -EAGAIN }, */
{ NFSERR_ACCES, -EACCES },
{ NFSERR_EXIST, -EEXIST },
{ NFSERR_XDEV, -EXDEV },
{ NFSERR_NODEV, -ENODEV },
{ NFSERR_NOTDIR, -ENOTDIR },
{ NFSERR_ISDIR, -EISDIR },
{ NFSERR_INVAL, -EINVAL },
{ NFSERR_FBIG, -EFBIG },
{ NFSERR_NOSPC, -ENOSPC },
{ NFSERR_ROFS, -EROFS },
{ NFSERR_MLINK, -EMLINK },
{ NFSERR_NAMETOOLONG, -ENAMETOOLONG },
{ NFSERR_NOTEMPTY, -ENOTEMPTY },
{ NFSERR_DQUOT, -EDQUOT },
{ NFSERR_STALE, -ESTALE },
{ NFSERR_REMOTE, -EREMOTE },
#ifdef EWFLUSH
{ NFSERR_WFLUSH, -EWFLUSH },
#endif
{ NFSERR_BADHANDLE, -EBADHANDLE },
{ NFSERR_NOT_SYNC, -ENOTSYNC },
{ NFSERR_BAD_COOKIE, -EBADCOOKIE },
{ NFSERR_NOTSUPP, -ENOTSUPP },
{ NFSERR_TOOSMALL, -ETOOSMALL },
{ NFSERR_SERVERFAULT, -EREMOTEIO },
{ NFSERR_BADTYPE, -EBADTYPE },
{ NFSERR_JUKEBOX, -EJUKEBOX },
{ -1, -EIO }
};
/*
* Convert an NFS error code to a local one.
* This one is used jointly by NFSv2 and NFSv3.
*/
int
nfs_stat_to_errno(int stat)
{
int i;
for (i = 0; nfs_errtbl[i].stat != -1; i++) {
if (nfs_errtbl[i].stat == stat)
return nfs_errtbl[i].errno;
}
dprintk("nfs_stat_to_errno: bad nfs status return value: %d\n", stat);
return nfs_errtbl[i].errno;
}
#define PROC(proc, argtype, restype, timer) \
[NFSPROC_##proc] = { \
.p_proc = NFSPROC_##proc, \
.p_encode = (kxdrproc_t)nfs2_xdr_enc_##argtype, \
.p_decode = (kxdrproc_t) nfs_xdr_##restype, \
.p_arglen = NFS_##argtype##_sz, \
.p_replen = NFS_##restype##_sz, \
.p_timer = timer, \
.p_statidx = NFSPROC_##proc, \
.p_name = #proc, \
}
struct rpc_procinfo nfs_procedures[] = {
PROC(GETATTR, fhandle, attrstat, 1),
PROC(SETATTR, sattrargs, attrstat, 0),
PROC(LOOKUP, diropargs, diropres, 2),
PROC(READLINK, readlinkargs, readlinkres, 3),
PROC(READ, readargs, readres, 3),
PROC(WRITE, writeargs, writeres, 4),
PROC(CREATE, createargs, diropres, 0),
PROC(REMOVE, removeargs, stat, 0),
PROC(RENAME, renameargs, stat, 0),
PROC(LINK, linkargs, stat, 0),
PROC(SYMLINK, symlinkargs, stat, 0),
PROC(MKDIR, createargs, diropres, 0),
PROC(RMDIR, diropargs, stat, 0),
PROC(READDIR, readdirargs, readdirres, 3),
PROC(STATFS, fhandle, statfsres, 0),
};
struct rpc_version nfs_version2 = {
.number = 2,
.nrprocs = ARRAY_SIZE(nfs_procedures),
.procs = nfs_procedures
};